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authorMarcelo Tosatti <mtosatti@redhat.com>2017-01-24 15:09:42 -0200
committerPaolo Bonzini <pbonzini@redhat.com>2017-02-08 17:16:20 +0100
commita0e136d436ded817c0aade72efdefa56a00b4e5e (patch)
tree8dabe40530f4b7e5742cece09fff99c6b6c2ed82 /drivers/ptp/Kconfig
parentf4066c2bc4d0de4e5dcbff21dae41e89fe8f38c0 (diff)
downloadlinux-a0e136d436ded817c0aade72efdefa56a00b4e5e.tar.bz2
PTP: add kvm PTP driver
Add a driver with gettime method returning hosts realtime clock. This allows Chrony to synchronize host and guest clocks with high precision (see results below). chronyc> sources MS Name/IP address Stratum Poll Reach LastRx Last sample =============================================================================== To configure Chronyd to use PHC refclock, add the following line to its configuration file: refclock PHC /dev/ptpX poll 3 dpoll -2 offset 0 Where /dev/ptpX is the kvmclock PTP clock. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Acked-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'drivers/ptp/Kconfig')
-rw-r--r--drivers/ptp/Kconfig12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/ptp/Kconfig b/drivers/ptp/Kconfig
index bdce33291161..384f661a6496 100644
--- a/drivers/ptp/Kconfig
+++ b/drivers/ptp/Kconfig
@@ -90,4 +90,16 @@ config PTP_1588_CLOCK_PCH
To compile this driver as a module, choose M here: the module
will be called ptp_pch.
+config PTP_1588_CLOCK_KVM
+ tristate "KVM virtual PTP clock"
+ depends on PTP_1588_CLOCK
+ depends on KVM_GUEST && X86
+ default y
+ help
+ This driver adds support for using kvm infrastructure as a PTP
+ clock. This clock is only useful if you are using KVM guests.
+
+ To compile this driver as a module, choose M here: the module
+ will be called ptp_kvm.
+
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